Nobuyuki Yamauchi
Sumitomo Metal Industries
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Featured researches published by Nobuyuki Yamauchi.
SAE International Congress and Exposition | 1983
Kazutoshi Kunishige; Nobuyuki Yamauchi; Takao Taka; Noriaki Nagao
Dual phase steel offers potential for wheel weight reduction, but has not been completely succeeded, in part, because of a localized necking or a fracture during rim fabrication. This failure should be related to a softening in the weld heat affected zone (HAZ). This paper investigates mechanical properties through microstructural change produced in the HAZ of as-rolled dual phase steel and finally suggests a practical solution. The softening, caused by heating the steel up to Ac1 in the HAZ, is found to be affected not only by tempering of martensite, but also by the variation of hardness in ferrite matrix. Moreover strain aging as well as work hardening due to up-setting stage during the flash welding also concerns this problem. Coiling temperature in manufacturing as-rolled dual phase steel has a large effect on the conditions of ferrite and martensite. Control of the temperature is of great importance to avoid such a localized necking or a fracture in the HAZ.
Isij International | 1989
Takao Taka; Kazutoshi Kunishige; Nobuyuki Yamauchi; Noriaki Nagao
Transactions of the Japan Welding Society | 1983
Nobuyuki Yamauchi; Yoji Inaba; Takao Taka
Archive | 1977
Nobuyuki Yamauchi; Takao Taka
Tetsu To Hagane-journal of The Iron and Steel Institute of Japan | 1982
Nobuyuki Yamauchi; Kazutoshi Kunishige; Takao Taka; Noriaki Nagao
SAE International Congress and Exposition | 1988
Takao Taka; Mutsuo Nakanishi; Nobuyuki Yamauchi
Quarterly Journal of The Japan Welding Society | 1987
Nobuyuki Yamauchi; Takao Taka
Transactions of the Japan Welding Society | 1984
Nobuyuki Yamauchi; Takao Taka
Archive | 1979
Nobuyuki Yamauchi; Yoji Inaba
Archive | 1977
Nobuyuki Yamauchi; Takao Taka